三峡大坝介绍【英

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1、GeographyCaseStudy-ChangJiangConsandProsoftheThreeGorgesProjectIntroductionChina'smassiveThreeGorgeshydroelectricprojecthasgeneratedplentyofcontroversyfromthestart.Itwasfirstproposedin1919byrevolutionaryleaderSunYat-senasawayofprovidingenergytofuelthenation'si

2、ndustrialdevelopment.Theplanwasrevivedin1954asawaytocontrolthechronicoverflowofthelegendaryYangtzeriveraftertensofthousandswerekilledinwidespreadflooding.Afterseveralfalsestarts,workbeganinearnestin1979.AdvocatessayChina'sdevelopmentdependsonit.Theysayitwillpro

3、videacleansourceofenergyforfuturegenerations.Butcriticssayitcouldbeamonumentalecologicaldisaster.Thedam'ssluicegateswereclosedonJune1,2003,allowingthereservoirbehindittobeginfilling.ByJune10,2003,thewaterwas135metresdeep,andit'sexpectedtobe175metresdeepby2009.F

4、actsThe16-yearprojectisduetobecompletedin2009.Theriver'slevelisexpectedtoriseto175metres.Bymid-June2003thedamwasholdingback12billioncubicmetresofwater.Thedam'sstoragecapacityisnearly40billioncubicmetres.Itwillcreatea658-sq.-kmreservoir.Itsconcretewallis192metre

5、shigh.Ithasatotalof22sluicegates.Itwillhave26700-megawattturbinegenerators.Theyareexpectedtoproduce18.2millionkilowattsby2009.ElevenofthereactorswereinplaceasofJanuary2005.Ithastheworld'slargestlocksystem,6?kilometresinlength.Thelockliftsandlowersshipsinfivesta

6、ges.ThedamislocatedinYichang,inthecentralprovinceofHubei.It'sChina'sbiggestengineeringprojectsincetheGreatWallwasbuiltmorethan2,000yearsago.Totalprojectedcost:180billionyuan($26.5billion).Locationof‘Sanxia’AmanfishesaswaterflowsthroughwaterdiversionholesoftheTh

7、reeGorgesDamontheYangtzeRiverincentralChina'sHubeiProvince,June11,2003.Some10waterdiversionholeswereopenedtoreleasewater.ThewaterleveloftheThreeGorgesReservoirreached135metres(433feet)onJune10.(APPhoto/Xinhua,DuHuaju)Twomencarrybrickstoabargeatthetemporarydocka

8、tWushan,inthemiddleoftheThreeGorgesontheYangtzeRiverincentralChina,June6,2003.Lowerlyingareasofthetownhavebeendemolishedinpreparationfortheincreaseinthewaterlevelasthecontro